/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with work for additional information
 * regarding copyright ownership.  The ASF licenses file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import React, { useCallback, useEffect, useMemo, useState } from 'react';
import {
  DatasourceType,
  ensureIsArray,
  FeatureFlag,
  GenericDataType,
  isFeatureEnabled,
  Metric,
  QueryFormMetric,
  tn,
} from '@superset-ui/core';
import { ColumnMeta } from '@superset-ui/chart-controls';
import { isEqual } from 'lodash';
import { usePrevious } from 'src/common/hooks/usePrevious';
import AdhocMetric from 'src/explore/components/controls/MetricControl/AdhocMetric';
import AdhocMetricPopoverTrigger from 'src/explore/components/controls/MetricControl/AdhocMetricPopoverTrigger';
import MetricDefinitionValue from 'src/explore/components/controls/MetricControl/MetricDefinitionValue';
import {
  DatasourcePanelDndItem,
  isDatasourcePanelDndItem,
} from 'src/explore/components/DatasourcePanel/types';
import { DndItemType } from 'src/explore/components/DndItemType';
import DndSelectLabel from 'src/explore/components/controls/DndColumnSelectControl/DndSelectLabel';
import { savedMetricType } from 'src/explore/components/controls/MetricControl/types';
import { AGGREGATES } from 'src/explore/constants';
import { DndControlProps } from './types';

const EMPTY_OBJECT = {};
const DND_ACCEPTED_TYPES = [DndItemType.Column, DndItemType.Metric];

const isDictionaryForAdhocMetric = (value: any) =>
  value && !(value instanceof AdhocMetric) && value.expressionType;

const coerceAdhocMetrics = (value: any) => {
  if (!value) {
    return [];
  }
  if (!Array.isArray(value)) {
    if (isDictionaryForAdhocMetric(value)) {
      return [new AdhocMetric(value)];
    }
    return [value];
  }
  return value.map(val => {
    if (isDictionaryForAdhocMetric(val)) {
      return new AdhocMetric(val);
    }
    return val;
  });
};

const getOptionsForSavedMetrics = (
  savedMetrics: savedMetricType[],
  currentMetricValues: (string | AdhocMetric)[],
  currentMetric?: string,
) =>
  savedMetrics?.filter(savedMetric =>
    Array.isArray(currentMetricValues)
      ? !currentMetricValues.includes(savedMetric.metric_name ?? '') ||
        savedMetric.metric_name === currentMetric
      : savedMetric,
  ) ?? [];

type ValueType = Metric | AdhocMetric | QueryFormMetric;

const columnsContainAllMetrics = (
  value: ValueType | ValueType[] | null | undefined,
  columns: ColumnMeta[],
  savedMetrics: (savedMetricType | Metric)[],
) => {
  const columnNames = new Set(
    [...(columns || []), ...(savedMetrics || [])]
      // eslint-disable-next-line camelcase
      .map(
        item =>
          (item as ColumnMeta).column_name ||
          (item as savedMetricType).metric_name,
      ),
  );

  return (
    ensureIsArray(value)
      .filter(metric => metric)
      // find column names
      .map(metric =>
        (metric as AdhocMetric).column
          ? (metric as AdhocMetric).column.column_name
          : (metric as ColumnMeta).column_name || metric,
      )
      .filter(name => name && typeof name === 'string')
      .every(name => columnNames.has(name))
  );
};

export type DndMetricSelectProps = DndControlProps<ValueType> & {
  savedMetrics: savedMetricType[];
  columns: ColumnMeta[];
  datasourceType?: DatasourceType;
};

export const DndMetricSelect = (props: any) => {
  const { onChange, multi, columns, savedMetrics } = props;

  const handleChange = useCallback(
    opts => {
      // if clear out options
      if (opts === null) {
        onChange(null);
        return;
      }

      const transformedOpts = ensureIsArray(opts);
      const optionValues = transformedOpts
        .map(option => {
          // pre-defined metric
          if (option.metric_name) {
            return option.metric_name;
          }
          return option;
        })
        .filter(option => option);
      onChange(multi ? optionValues : optionValues[0]);
    },
    [multi, onChange],
  );

  const [value, setValue] = useState<ValueType[]>(
    coerceAdhocMetrics(props.value),
  );
  const [droppedItem, setDroppedItem] = useState<
    DatasourcePanelDndItem | typeof EMPTY_OBJECT
  >({});
  const [newMetricPopoverVisible, setNewMetricPopoverVisible] = useState(false);
  const prevColumns = usePrevious(columns);
  const prevSavedMetrics = usePrevious(savedMetrics);

  useEffect(() => {
    setValue(coerceAdhocMetrics(props.value));
  }, [JSON.stringify(props.value)]);

  useEffect(() => {
    if (
      !isEqual(prevColumns, columns) ||
      !isEqual(prevSavedMetrics, savedMetrics)
    ) {
      // Remove all metrics if selected value no longer a valid column
      // in the dataset. Must use `nextProps` here because Redux reducers may
      // have already updated the value for this control.
      if (!columnsContainAllMetrics(props.value, columns, savedMetrics)) {
        onChange([]);
      }
    }
  }, [
    prevColumns,
    columns,
    prevSavedMetrics,
    savedMetrics,
    props.value,
    onChange,
  ]);

  const canDrop = useCallback(
    (item: DatasourcePanelDndItem) => {
      const isMetricAlreadyInValues =
        item.type === 'metric' ? value.includes(item.value.metric_name) : false;
      return !isMetricAlreadyInValues;
    },
    [value],
  );

  const onNewMetric = useCallback(
    (newMetric: Metric) => {
      const newValue = props.multi ? [...value, newMetric] : [newMetric];
      setValue(newValue);
      handleChange(newValue);
    },
    [handleChange, props.multi, value],
  );

  const onMetricEdit = useCallback(
    (changedMetric: Metric | AdhocMetric, oldMetric: Metric | AdhocMetric) => {
      if (oldMetric instanceof AdhocMetric && oldMetric.equals(changedMetric)) {
        return;
      }
      const newValue = value.map(value => {
        if (
          // compare saved metrics
          ('metric_name' in oldMetric && value === oldMetric.metric_name) ||
          // compare adhoc metrics
          typeof (value as AdhocMetric).optionName !== 'undefined'
            ? (value as AdhocMetric).optionName ===
              (oldMetric as AdhocMetric).optionName
            : false
        ) {
          return changedMetric;
        }
        return value;
      });
      setValue(newValue);
      handleChange(newValue);
    },
    [handleChange, value],
  );

  const onRemoveMetric = useCallback(
    (index: number) => {
      if (!Array.isArray(value)) {
        return;
      }
      const valuesCopy = [...value];
      valuesCopy.splice(index, 1);
      setValue(valuesCopy);
      onChange(valuesCopy);
    },
    [onChange, value],
  );

  const moveLabel = useCallback(
    (dragIndex: number, hoverIndex: number) => {
      const newValues = [...value];
      [newValues[hoverIndex], newValues[dragIndex]] = [
        newValues[dragIndex],
        newValues[hoverIndex],
      ];
      setValue(newValues);
    },
    [value],
  );

  const newSavedMetricOptions = useMemo(
    () => getOptionsForSavedMetrics(props.savedMetrics, props.value),
    [props.savedMetrics, props.value],
  );

  const getSavedMetricOptionsForMetric = useCallback(
    index =>
      getOptionsForSavedMetrics(
        props.savedMetrics,
        props.value,
        props.value?.[index],
      ),
    [props.savedMetrics, props.value],
  );

  const handleDropLabel = useCallback(
    () => onChange(multi ? value : value[0]),
    [multi, onChange, value],
  );

  const valueRenderer = useCallback(
    (option: ValueType, index: number) => (
      <MetricDefinitionValue
        key={index}
        index={index}
        option={option}
        onMetricEdit={onMetricEdit}
        onRemoveMetric={onRemoveMetric}
        columns={props.columns}
        savedMetrics={props.savedMetrics}
        savedMetricsOptions={getSavedMetricOptionsForMetric(index)}
        datasourceType={props.datasourceType}
        onMoveLabel={moveLabel}
        onDropLabel={handleDropLabel}
        type={`${DndItemType.AdhocMetricOption}_${props.name}_${props.label}`}
        multi={multi}
      />
    ),
    [
      getSavedMetricOptionsForMetric,
      handleDropLabel,
      moveLabel,
      multi,
      onMetricEdit,
      onRemoveMetric,
      props.columns,
      props.datasourceType,
      props.label,
      props.name,
      props.savedMetrics,
    ],
  );

  const valuesRenderer = useCallback(
    () => value.map((value, index) => valueRenderer(value, index)),
    [value, valueRenderer],
  );

  const togglePopover = useCallback((visible: boolean) => {
    setNewMetricPopoverVisible(visible);
  }, []);

  const closePopover = useCallback(() => {
    togglePopover(false);
  }, [togglePopover]);

  const handleDrop = useCallback(
    (item: DatasourcePanelDndItem) => {
      if (item.type === DndItemType.Metric) {
        onNewMetric(item.value as Metric);
      }
      if (item.type === DndItemType.Column) {
        setDroppedItem(item);
        togglePopover(true);
      }
    },
    [onNewMetric, togglePopover],
  );

  const handleClickGhostButton = useCallback(() => {
    setDroppedItem({});
    togglePopover(true);
  }, [togglePopover]);

  const adhocMetric = useMemo(() => {
    if (
      isDatasourcePanelDndItem(droppedItem) &&
      droppedItem.type === DndItemType.Column
    ) {
      const itemValue = droppedItem.value as ColumnMeta;
      const config: Partial<AdhocMetric> = {
        column: { column_name: itemValue?.column_name },
      };
      if (isFeatureEnabled(FeatureFlag.UX_BETA)) {
        if (itemValue.type_generic === GenericDataType.NUMERIC) {
          config.aggregate = AGGREGATES.SUM;
        } else if (
          itemValue.type_generic === GenericDataType.STRING ||
          itemValue.type_generic === GenericDataType.BOOLEAN ||
          itemValue.type_generic === GenericDataType.TEMPORAL
        ) {
          config.aggregate = AGGREGATES.COUNT_DISTINCT;
        }
      }
      return new AdhocMetric(config);
    }
    return new AdhocMetric({ isNew: true });
  }, [droppedItem]);

  const ghostButtonText = isFeatureEnabled(FeatureFlag.ENABLE_DND_WITH_CLICK_UX)
    ? tn(
        'Drop a column/metric here or click',
        'Drop columns/metrics here or click',
        multi ? 2 : 1,
      )
    : tn(
        'Drop column or metric here',
        'Drop columns or metrics here',
        multi ? 2 : 1,
      );

  return (
    <div className="metrics-select">
      <DndSelectLabel
        onDrop={handleDrop}
        canDrop={canDrop}
        valuesRenderer={valuesRenderer}
        accept={DND_ACCEPTED_TYPES}
        ghostButtonText={ghostButtonText}
        displayGhostButton={multi || value.length === 0}
        onClickGhostButton={
          isFeatureEnabled(FeatureFlag.ENABLE_DND_WITH_CLICK_UX)
            ? handleClickGhostButton
            : undefined
        }
        {...props}
      />
      <AdhocMetricPopoverTrigger
        adhocMetric={adhocMetric}
        onMetricEdit={onNewMetric}
        columns={props.columns}
        savedMetricsOptions={newSavedMetricOptions}
        savedMetric={EMPTY_OBJECT as savedMetricType}
        datasourceType={props.datasourceType}
        isControlledComponent
        visible={newMetricPopoverVisible}
        togglePopover={togglePopover}
        closePopover={closePopover}
      >
        <div />
      </AdhocMetricPopoverTrigger>
    </div>
  );
};